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Refactor and compile masking code again
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Original file line number | Diff line number | Diff line change |
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@@ -1,2 +1,4 @@ | ||
golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE= | ||
golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= | ||
golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4= | ||
golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= |
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Original file line number | Diff line number | Diff line change |
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//go:build !amd64 && !arm64 && !js | ||
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package websocket | ||
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import ( | ||
"encoding/binary" | ||
"math/bits" | ||
) | ||
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// mask applies the WebSocket masking algorithm to p | ||
// with the given key. | ||
// See https://tools.ietf.org/html/rfc6455#section-5.3 | ||
// | ||
// The returned value is the correctly rotated key to | ||
// to continue to mask/unmask the message. | ||
// | ||
// It is optimized for LittleEndian and expects the key | ||
// to be in little endian. | ||
// | ||
// See https://github.com/golang/go/issues/31586 | ||
func mask(key uint32, b []byte) uint32 { | ||
if len(b) >= 8 { | ||
key64 := uint64(key)<<32 | uint64(key) | ||
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// At some point in the future we can clean these unrolled loops up. | ||
// See https://github.com/golang/go/issues/31586#issuecomment-487436401 | ||
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// Then we xor until b is less than 128 bytes. | ||
for len(b) >= 128 { | ||
v := binary.LittleEndian.Uint64(b) | ||
binary.LittleEndian.PutUint64(b, v^key64) | ||
v = binary.LittleEndian.Uint64(b[8:16]) | ||
binary.LittleEndian.PutUint64(b[8:16], v^key64) | ||
v = binary.LittleEndian.Uint64(b[16:24]) | ||
binary.LittleEndian.PutUint64(b[16:24], v^key64) | ||
v = binary.LittleEndian.Uint64(b[24:32]) | ||
binary.LittleEndian.PutUint64(b[24:32], v^key64) | ||
v = binary.LittleEndian.Uint64(b[32:40]) | ||
binary.LittleEndian.PutUint64(b[32:40], v^key64) | ||
v = binary.LittleEndian.Uint64(b[40:48]) | ||
binary.LittleEndian.PutUint64(b[40:48], v^key64) | ||
v = binary.LittleEndian.Uint64(b[48:56]) | ||
binary.LittleEndian.PutUint64(b[48:56], v^key64) | ||
v = binary.LittleEndian.Uint64(b[56:64]) | ||
binary.LittleEndian.PutUint64(b[56:64], v^key64) | ||
v = binary.LittleEndian.Uint64(b[64:72]) | ||
binary.LittleEndian.PutUint64(b[64:72], v^key64) | ||
v = binary.LittleEndian.Uint64(b[72:80]) | ||
binary.LittleEndian.PutUint64(b[72:80], v^key64) | ||
v = binary.LittleEndian.Uint64(b[80:88]) | ||
binary.LittleEndian.PutUint64(b[80:88], v^key64) | ||
v = binary.LittleEndian.Uint64(b[88:96]) | ||
binary.LittleEndian.PutUint64(b[88:96], v^key64) | ||
v = binary.LittleEndian.Uint64(b[96:104]) | ||
binary.LittleEndian.PutUint64(b[96:104], v^key64) | ||
v = binary.LittleEndian.Uint64(b[104:112]) | ||
binary.LittleEndian.PutUint64(b[104:112], v^key64) | ||
v = binary.LittleEndian.Uint64(b[112:120]) | ||
binary.LittleEndian.PutUint64(b[112:120], v^key64) | ||
v = binary.LittleEndian.Uint64(b[120:128]) | ||
binary.LittleEndian.PutUint64(b[120:128], v^key64) | ||
b = b[128:] | ||
} | ||
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// Then we xor until b is less than 64 bytes. | ||
for len(b) >= 64 { | ||
v := binary.LittleEndian.Uint64(b) | ||
binary.LittleEndian.PutUint64(b, v^key64) | ||
v = binary.LittleEndian.Uint64(b[8:16]) | ||
binary.LittleEndian.PutUint64(b[8:16], v^key64) | ||
v = binary.LittleEndian.Uint64(b[16:24]) | ||
binary.LittleEndian.PutUint64(b[16:24], v^key64) | ||
v = binary.LittleEndian.Uint64(b[24:32]) | ||
binary.LittleEndian.PutUint64(b[24:32], v^key64) | ||
v = binary.LittleEndian.Uint64(b[32:40]) | ||
binary.LittleEndian.PutUint64(b[32:40], v^key64) | ||
v = binary.LittleEndian.Uint64(b[40:48]) | ||
binary.LittleEndian.PutUint64(b[40:48], v^key64) | ||
v = binary.LittleEndian.Uint64(b[48:56]) | ||
binary.LittleEndian.PutUint64(b[48:56], v^key64) | ||
v = binary.LittleEndian.Uint64(b[56:64]) | ||
binary.LittleEndian.PutUint64(b[56:64], v^key64) | ||
b = b[64:] | ||
} | ||
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// Then we xor until b is less than 32 bytes. | ||
for len(b) >= 32 { | ||
v := binary.LittleEndian.Uint64(b) | ||
binary.LittleEndian.PutUint64(b, v^key64) | ||
v = binary.LittleEndian.Uint64(b[8:16]) | ||
binary.LittleEndian.PutUint64(b[8:16], v^key64) | ||
v = binary.LittleEndian.Uint64(b[16:24]) | ||
binary.LittleEndian.PutUint64(b[16:24], v^key64) | ||
v = binary.LittleEndian.Uint64(b[24:32]) | ||
binary.LittleEndian.PutUint64(b[24:32], v^key64) | ||
b = b[32:] | ||
} | ||
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// Then we xor until b is less than 16 bytes. | ||
for len(b) >= 16 { | ||
v := binary.LittleEndian.Uint64(b) | ||
binary.LittleEndian.PutUint64(b, v^key64) | ||
v = binary.LittleEndian.Uint64(b[8:16]) | ||
binary.LittleEndian.PutUint64(b[8:16], v^key64) | ||
b = b[16:] | ||
} | ||
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// Then we xor until b is less than 8 bytes. | ||
for len(b) >= 8 { | ||
v := binary.LittleEndian.Uint64(b) | ||
binary.LittleEndian.PutUint64(b, v^key64) | ||
b = b[8:] | ||
} | ||
} | ||
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// Then we xor until b is less than 4 bytes. | ||
for len(b) >= 4 { | ||
v := binary.LittleEndian.Uint32(b) | ||
binary.LittleEndian.PutUint32(b, v^key) | ||
b = b[4:] | ||
} | ||
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// xor remaining bytes. | ||
for i := range b { | ||
b[i] ^= byte(key) | ||
key = bits.RotateLeft32(key, -8) | ||
} | ||
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return key | ||
} |
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